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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd48bf882dede4dd0f45a50c91ab626d7db27f1ade9c84bc6466df7f67ab5c8c0' 
  AND token = 'QEAZpIt2R7OQTk+zPM62wXtKGxHXK8Qni6yN3tMm/2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}